P&G or steady state driving?

This write-up might help: http://priuschat.com/forums/gen-ii-...troduction-prius-power-flow-3.html#post376040

Bob Wilson

 

Second Answer... sorry. On to SHM, this is a special case of the heretical "balance" that you may be able to trigger in your Gen I. If you have a scan tool and are monitoring "Throttle" in one of theses ODBII pids might be useful. These throttle readings are Engine throttle, not to be confused with "input throttle" (<== made up term). The Prius ECU takes your throttle request and splits it into MG throttle and ICE throttle.

Anyway... watching Engine Throttle, and Injection Timing and RPM should give you some feedback on "input throttle". So SHM is when your rpm is near idle (about 1100-1200 in Gen II). Once at this low RPM hold the pedal steady enough for Engine Throttle and Injection Timing to hold their values UNCHANGED for 7 seconds. After 7 seconds, your Engine Throttle will decrement by one and your MPG will jump.

For Gen II it looks like this:

	Column 1	Column 2	Column 3
0	__	_Before_	_After
1	RPM	1100-1200	1100-1200
2	IGN	14	14
3	TPS	18	17

SHM will bleed speed over a few miles, so you will eventually need to "pulse" back up if needed. There is volumes written on SHM, but I can't find the PC links to it. So SHM is ONE of many "heretical balance" states. They exist throughout the throttle range, but they are VERY hard to hit without instrumentation of some kind, and a VERY disciplined right foot.

1101101

 

I pulse ... ergo I glide thus, one necessarily slows down between pulsing. I'll be ready to post a new EPA buster in the "I beat the EPA" thread, when I finish off the present tank. As the pic from earlier today shows, I've got 6 pips to go. It's not my 1st 70+mpg tank bar far, but it may be my 1st 800 miles per tank. Woo hoo!






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